Suction roll



E. T. STREET sUoTIoN ROLL Jan. 4, 1944.

, 1938 2 SheetS-Sheet l Original Filed May 19 Jan. 4, 1944. E. T. STREETSUCTION ROLL Original Filed May 19, 1958 2 Sheets-Sheet 2 Patented Jan.'4, 1944 sUc'rroN ROLL h Edwaratr. street, nowningtowmgra., asignor toDownlngto wn Manufacturing Company,

Downinztown, Pa., a corporation of Pennsylvania Original application May19, 1938, Serial No.

208,887. Divided and this application Jun 9, 1939, Serial No. 278,335

(cl. 92-53) I 4 Claims.

This invention relates to suction rolls and, more particularly, to asuction roll especially adapted for use as a suction couch for thecylinder molds of board machinesand is a. division of my copendingapplication Serial No. 208,887, led May 19, 1938, for Suction couch forcylinder molds. l i.

An important object of the invention is to provide a lsuction rollhaving a vsuction box so constructed that the suction in the roll mayact to actually lift the water drawn from the paper web or felt withwhich the suction roll is engaged through a considerable distance and ata high vertical angle.

Another object of the invention is the provision of a suction rollhaving a suction box the,eiec tive width of which may be altered duringoperation of the roll.

Another object of the invention is the provision of a suction rollhaving primary andsecondary through springs 38 mounted on supports 39-car- 'l5 40 which slidably engages the plate and which has l a deckle 4Iengaging the inner wall of the shell.

suction boxes in which the suction exerted in the secondary suction boxmay be controlled.

These and other-objects I attain by the nstruction shown in theyaccompanying drawings wherein, for the purpose 'of illustration, 'Ihave shown v'a preferred embodiment of my invention and wherein: f

Fig. 1 is a longitudinal sectional view through a suction rollconstructed in accordance with my invention;

Fig. 2 is a section on line 2-2 of Fig. 1;

Fig. 3 is a section on line 3-3 of Fig. 2; and

Fig. 4 is a section on line 4--4 of Figf2,

The suction roll I5 is of relatively light construction, beingpreferablyA about 18 inches in diameter, and has the usual drilled shellI1 which is preferably provided with a correspondingly drilled rubberfacing I8. This roll is mounted in suitable journals I9 supported by thearms I4, of which there is, of course, one at each end or the roll, andhas arranged therein a suction box 20 held in rotatably adjustedpositions through'set screws 2|. i

The suction box has a suction chamber 2 which is disposed centrally ofthe shell and preferably in alignment with the tubular extensions andhas a mouth 28 defining a primary section area P controlled by sidedeckles 29 and end deckles 30 the latter being adjustable throughrotatably threaded shafts.3l extending through packing boxes 32 in thefittings 23. The mouth 28 of the suction box is connected with thechamber 21 by inwardly converging Walls 33 so that the suction effortexerted in chamber 21 will cause a, constantly increasing velocity inthe throat 34 of the box and thus prevent moisture contained in the airdrawn through the openings of the shell from dropping back upon thesurface of theshell. l

Slightly spaced from the rear face of the trailing wall 33 of the mainsuction box is an abl breviated radial wall 35 extending outwardly fromthe wall 36 of the suction chamber. ivoted to the outer end of thewall35 is an arcuate plate 31 the curvature -ofwhich is substantiallyconcentric with the axis of the suction chamber and .with the wall ofthe shell. This plate is constantly urged toward the inner wall of theshell ried by the suction chamber andbetween the plate and the shell isarranged a deckle carrier The deckle carrier may be adjustedcircumferentially of the shell `and to this end I provide a plurality ofcams 42 at present shown as mounted on a common rod 43 operated by a rod44 extending through the suction chamber and having 'an angular end '45projecting through a slot in the wall 36 and provided at the outersurface of this wall with a sealing means 46 for the'slot.

Rod 44 may be adjusted in any suitable manner, as by means of a threadedhand nut 41.A The cams 42 have slots 48 receiving arms 49 carried by oneend of bell crank levers 50 pivotally mounted upon supports 5I extendingoutwardly from the suction box. The opposite ends of the bell cranklevers are linked to the deckle carrier 40 as at 52.

It will be seen that this deckle carriertogether with the trailing Wall33 of the primary suction area deiines a secondary suction area, andthis suction area may be evacuated from any suitable source. At presentI have disclosed openings 53 in the Wall 36 communicating with thissuction area and controlled by valves 54 which are, in turn, controlledby a longitudinally extending rod 55 leading out from the end, of thesuction chamber. Through these valves the extent of the suction createdin the secondary varea may be determined.

Since the construction illustrated is obviously capable of considerablemodiiication without departing from the spirit of my invention, I do notwish to be understood as limiting myself thereto except as hereinafterclaimed.

I claim:

1. In a suction roll and in combination with the rotating shell of theroll, a suction chamber, suction area dening means comprising astasection, a circumferentially extending ,plate pivoted at one end tosaid suction chamber and abutting 'the inner face of saidcircumferentially.

movable wall section, and spring means for maintaining said plate inengagement with said circumferentially movable Wall.

p 2. In a suction roll and in combination with the rotating shell of theroll, a suction chamber, suction area defining means comprising astationary wall,` a circumferentially shiftable wall section, acircumferentially extending plate pvoted at one end to said suctionchamber and abutting the inner face' of said circumferentially movablewall section, spring means for maintaining said yplate in engagementwith saicl circumferentially movable Wall, and means operableiduringrotation of the shell for circumferentially shifting said wall.

3. In a suction roll and in combination with the rotating shell of theroll, a suction chamber, suction area dening means comprising astationary Wall, a circumferentially shiftable wall section, acircumferentially extending plate pivoted at one end to said suctionchamber. and abutting the inner face of said circumferentially movablewall section, and spring means for maintaining said plate in engagementwith said circumferentially movable wall, said stationary Wall havingvalve controlled openings placing the space between said walls incommunication with the suction chamber.

4. In a suction roll and in combinationywith the rotating shell of theroll, a suction chamber, suction area defining means comprising astationary Wall, a circumferentially shitable wall section, acircumferentially extending plate pivoted at one end to said suctionchamber and abutting the inner face of said circumferentially movablewall section, spring means for'maintaining said plate in engagement withsaid circumferentially movable wall, and means operable during rotationof the shell for circumferentially shifting said Wall, said stationarywall having valve controlled openings placing the space between saidWalls in communication-with the suction chamber. 1

EDWARD T. STREET.

